三升四年级数学 简便计算练习题

三升四年级数学 简便计算练习题


简介:
273-73-27 =273-(73+27) =273-100 =173 725-76-24 =725-(76+24) =725-100 =625 1036-155-245 =1036-(155+245) =1036-400 =636 871-299 =971-300+1 =671+1 =672 576-285+85 =576-(285-85) =576-200 =376 748-351+252-149 =(748+252)-(351+149) =1000-500 =500 (355-140)-(360-245) =(355+245)-(140+360) =600-500 =100 6756+193-(756-207) =(6756-756)+(193+207) =6000+400 =6400